Ejector for excavator-dippers.



PATENTED DEC. 18, 1906.

0. STROM. EJBGTOR FOR EXOAVATOR DIPPBRS.

APPLIQATION FILED APR.30. 1906.

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PATENTED DEO.'18, 1906.

r 0. STROM. EJBOTOR FOR EXGAVATOR DIPPERS.

APPLICATION FILED. APR. 30.1906.

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f/AS 1977'0/7/8575 THE NORRIS PETERS ca, wAsmmzro UNITED STATES PATENToFFIon.

CHARLES STROM, OF ST. PAUL, MINNESOTA, ASSIGNOR TO AMERICAN HOIST &DERRICK (30., OF ST. PAUL, MINNESOTA, A CORPORATION.

are. 838,914.

Specification of Letters Patent.

Patented Dec. 18, 1906.

Application filed April 30, 1906. Serial No. 314,423-

ToaZZ whom it may concern:

Be it known that I, CHARLES STnoM, of St. Paul, county of Ramsey, Stateof Minnesota, have invented certain new and useful Improvements inEjectors for Excavator-Dippers, of which the following is aspecification.

This invention relates to improvements in devices designed for ejectingmaterial from the dipper of a steam shovel or excavator.

It frequently occurs when using a device of this kind for excavating mudor clay that the material will bridge across and stick in the dipperwhen the bottom is opened for the purpose of emptying the dipper.

The present invention is designed to provide a simple and effectivemeans for ejecting the material from the dipper if it fails to fall outof its own weight.

The invention consists generally in an excavator provided with anejector bar or plunger supported in the path of movement of the dipper,so that by raising the dipper the material is brought into contact withthe ejector and is thereby forced out through the open end of thedipper.

In the accompanying drawings, forming part of this specification, Figure1 is an elevation of a steam-shovel embodying my invention. Fig. 2 is aside elevation on an enlarged scale, showing the end of theboom, thedipper, and the ejector. Fig. 3 is a similar view showing the trap-dooror bottom of the dipper open and the ejector in contact with thematerial in the dipper, a portion of the wall of the dipper being brokenaway.

In the drawings, 2 represents the platform or car of a steam-shovelembodying my invention.

3 represents the turn-table, carrying the engine 4, boiler 5, and themechanism for raising and lowering the boom and'operating the dipper.

6 represents the boom, which is pivoted to the platform 3 and haspivoted to it the dipper-arm 7, carrying the dipper 8, which is ofsuitable form to dip or scoop up a load of material. This dipper isprovided with a trapdoor or hinged bottom 9. Suitable means are alsoprovided for releasing the door, said means being under control of theoperator stationed upon the platform 3. The dipper is provided with apivoted bail 10, carrying a sheave or pulley 11, and a cable 12, whichhas one end connected to the boom, passes around the pulley 11 andaround a pulley 13 on the end of the boom, and to suitable operatingmeans upon the platform 3.

I provide upon the boom 6, preferably at the end thereof, adownwardly-projecting ejector-bar 14, having preferably a plunger heador face 15. This bar is secured rigidly to the boom, and a suitablebrace 16 is preferably provided, which is connected to said bar and alsoto the boom. This bar is arranged in the path of movement of saiddipper, so that when the tra -door 9 is opened, as shown in Fig. 3 ofthe rawings, if the material in the dipper sticks therein and does notfall out the dipper may be raised, so as to cause it to telescope uponthe bar, (see Fig. 3,) thereby forcing any material that sticks in thedipper out through the open bottom thereof.

I do not confine myself to any particular size or form of the ejector orthe means for supporting the same upon the boom. These features may bevaried in many particulars without departing from my invention.

I claim as my invention 1. The combination in a device of the classdescribed, with a boom, and a swinging dipper having a hinged bottom, ofan ejector-bar secured to and projecting downwardly from said boom inthe path of movement of said dipper, for the purpose specified.

2. The combination, with the boom, the arm pivoted thereto and carryingat its end a dipper having an open top and a hinged bottom, and meansfor raising and lowering said arm and dipper, of an ejector-bar securedto said boom and projecting downwardly therefrom.

In witness whereof I have hereunto set my hand this 24th day of April,1906.

CHAS. STROM.

Witnesses:

R. T. REILLY, R. S. GAIsFoRn.

